Added GetAllUsersApplication and corresponding test

backend/internal/database/db.go

@@ -24,6 +24,7 @@ type Database interface {
 	AddUserToProject(username string, projectname string, role string) error
 	ChangeUserRole(username string, projectname string, role string) error
 	GetAllUsersProject(projectname string) ([]UserProjectMember, error)
+	GetAllUsersApplication() ([]string, error)
 }
 
 // This struct is a wrapper type that holds the database connection
@@ -175,6 +176,36 @@ func (d *Db) GetAllUsersProject(projectname string) ([]UserProjectMember, error)
 	return users, nil
 }
 
+// GetAllUsersApplication retrieves all usernames from the database
+func (d *Db) GetAllUsersApplication() ([]string, error) {
+	// Define the SQL query to fetch all usernames
+	query := `
+        SELECT username FROM users
+    `
+
+	// Execute the query
+	rows, err := d.Queryx(query)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	// Iterate over the rows and populate the result slice
+	var usernames []string
+	for rows.Next() {
+		var username string
+		if err := rows.Scan(&username); err != nil {
+			return nil, err
+		}
+		usernames = append(usernames, username)
+	}
+	if err := rows.Err(); err != nil {
+		return nil, err
+	}
+
+	return usernames, nil
+}
+
 // Reads a directory of migration files and applies them to the database.
 // This will eventually be used on an embedded directory
 func (d *Db) Migrate(dirname string) error {

backend/internal/database/db_test.go

@@ -240,3 +240,49 @@ func TestGetAllUsersProject(t *testing.T) {
 		t.Error("User user not found")
 	}
 }
+
+func TestGetAllUsersApplication(t *testing.T) {
+	db, err := setupState()
+	if err != nil {
+		t.Error("setupState failed:", err)
+	}
+
+	err = db.AddUser("testuser1", "password")
+	if err != nil {
+		t.Error("AddUser failed:", err)
+	}
+
+	err = db.AddUser("testuser2", "password")
+	if err != nil {
+		t.Error("AddUser failed:", err)
+	}
+
+	users, err := db.GetAllUsersApplication()
+	if err != nil {
+		t.Error("GetAllUsersApplication failed:", err)
+	}
+
+	// Check if both users are returned
+	if len(users) != 2 {
+		t.Errorf("Expected 2 users, got %d", len(users))
+	}
+
+	// Check if the test users are included in the list
+	foundTestUser1 := false
+	foundTestUser2 := false
+	for _, user := range users {
+		if user == "testuser1" {
+			foundTestUser1 = true
+		}
+		if user == "testuser2" {
+			foundTestUser2 = true
+		}
+	}
+
+	if !foundTestUser1 {
+		t.Error("testuser1 not found")
+	}
+	if !foundTestUser2 {
+		t.Error("testuser2 not found")
+	}
+}